I play TF2 a good bit though I haven't lately because my pc is facked up (thank you nvidia hardware firewall, you can kiss my ass). But when I get this fixed I'll be playing as Gravdigr.
Incidentally I got orange box for the xbox 360 and can safely say TF2 sucks the nut on the 360. There is no central server so games on hosted on whoever started the games box. So say I want to start a 16 person game, I would have to host it over my connection which 768k up is nowhere near enough bandwidth. And since almost nobody has their 360 connected to fiber very few people are able to host a game with over 8 people.
TF2 is a game made for 20 people per team, not 4.